Ceramic capacitors: how to read 2-digit markings?

Related question: Ceramic capacitors: how to read 3-digit markings?

I have some ceramic capacitors with a 2-digit marking. How to read them? Do the colored markings at the top mean anything?

Image description:

• Brown ceramic capacitors with 10 written and a black mark at the top



• Brown ceramic capacitors with 47 written


• Yellow ceramic capactiors with 1n0 written and a green mark at the top

Answer

The brown capacitors have values in picoFarads

eg
47 = 47 picoFarad = 47 pF = 0.000 000 000 047 Farad !
10 = 10 pF

For the yellow and green capacitors with markings of the form

anb

Here n = nanoFarad = nF.

1n0 = 1.0 nF
2n2 = 2.2 nF
6n8 = 6.8 nF

Note that the use of xNx here is (probably) unqiue to capacitors in the nF range - I do not recall seeing eg xPx or xUx markings ever.

However page 70 of this superbVishay ceramic single layer capacitors document suggests you might expect to meet any of eg

p68 = 0.68 pF
n15 = 0.15nF = 150 pF
5p0 = 5 pF etc

The green dot is quite likely to be a voltage rating, but alas I don't know what system it uses. There are several different colour/voltage systems. Typically this sort of capacitor is 50 Volt rated but this is not certain.

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More usual nnX 3 digit markings

Most capacitor numerical markings are 3 digit and express the value in pF (pico Farad = 10^-12 Farad) with the last digit being a power of 10 multiplier.

So

223 = 22,000 pF = 22 nF = 0.022 uF = 0.000 000 022 F

106 = 10 000 000 pF = 10 uF
100 = 10 pF and NOT 100 pF etc

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Part of a larger tutorial series on capacitors. Deals in colour codes. Does not answer exact question but is useful

This does NOT answer the original question but is useful